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Rayan
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Before contest
Codeforces Round (Div. 3)
6 days
→ Filter Problems
Difficulty:
—
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
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Status
Standings
Custom test
Problems
#
Name
733D
Kostya the Sculptor
data structures
,
hashing
1600
x4205
731C
Socks
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7123
730G
Car Repair Shop
implementation
1600
x2199
727B
Bill Total Value
expression parsing
,
implementation
,
strings
1600
x2036
725C
Hidden Word
brute force
,
constructive algorithms
,
implementation
,
strings
1600
x2706
723D
Lakes in Berland
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1600
x7075
723C
Polycarp at the Radio
greedy
1600
x4818
722C
Destroying Array
data structures
,
dsu
1600
x9781
715A
Plus and Square Root
constructive algorithms
,
math
1600
x5656
712C
Memory and De-Evolution
greedy
,
math
1600
x5969
706C
Hard problem
dp
,
strings
1600
x16878
704A
Thor
brute force
,
data structures
,
implementation
1600
x9526
691B
s-palindrome
implementation
,
strings
1600
x7561
689B
Mike and Shortcuts
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x6112
683C
Symmetric Difference
*special problem
1600
x328
683B
The Teacher of Physical Education
*special problem
1600
x323
682C
Alyona and the Tree
dfs and similar
,
dp
,
graphs
,
trees
1600
x7390
681C
Heap Operations
constructive algorithms
,
data structures
,
greedy
1600
x8026
678C
Joty and Chocolate
implementation
,
math
,
number theory
1600
x9915
678B
The Same Calendar
implementation
1600
x4174
665A
Buses Between Cities
implementation
1600
x2988
660C
Hard Process
binary search
,
dp
,
two pointers
1600
x9731
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7569
649D
Дефрагментация памяти
constructive algorithms
,
greedy
,
implementation
1600
x390
645C
Enduring Exodus
binary search
,
two pointers
1600
x3508
643B
Bear and Two Paths
constructive algorithms
,
graphs
1600
x3219
639B
Bear and Forgotten Tree 3
constructive algorithms
,
graphs
,
trees
1600
x6582
637D
Running with Obstacles
*special problem
,
data structures
,
dp
,
greedy
1600
x2044
630G
Challenge Pennants
combinatorics
,
math
1600
x2904
626C
Block Towers
brute force
,
greedy
,
math
,
number theory
1600
x4388
618C
Constellation
geometry
,
implementation
1600
x4361
617C
Watering Flowers
implementation
1600
x4930
616D
Longest k-Good Segment
binary search
,
data structures
,
two pointers
1600
x10254
616C
The Labyrinth
dfs and similar
1600
x5998
615B
Longtail Hedgehog
dp
,
graphs
1600
x5220
607A
Chain Reaction
binary search
,
dp
1600
x9773
606B
Testing Robots
implementation
1600
x2781
605A
Sorting Railway Cars
constructive algorithms
,
greedy
1600
x7229
603A
Alternative Thinking
dp
,
greedy
,
math
1600
x7770
601A
The Two Routes
graphs
,
shortest paths
1600
x12387
600A
Extract Numbers
implementation
,
strings
1600
x5403
599C
Day at the Beach
sortings
1600
x4709
597B
Restaurant
dp
,
greedy
,
sortings
1600
x5046
597A
Divisibility
math
1600
x4602
595B
Pasha and Phone
binary search
,
math
1600
x2936
593B
Anton and Lines
geometry
,
sortings
1600
x4073
573B
Bear and Blocks
binary search
,
data structures
,
dp
,
math
1600
x6006
570C
Replacement
constructive algorithms
,
data structures
,
implementation
1600
x9286
568A
Primes or Palindromes?
brute force
,
implementation
,
math
,
number theory
1600
x5168
559A
Gerald's Hexagon
brute force
,
geometry
,
math
1600
x10528
538C
Tourist's Notes
binary search
,
brute force
,
greedy
,
implementation
,
math
1600
x5893
534C
Polycarpus' Dice
math
1600
x5084
530D
Set subtraction
*special problem
1600
x454
530B
String inside out
*special problem
1600
x544
525C
Ilya and Sticks
greedy
,
math
,
sortings
1600
x5847
524A
Возможно, вы знаете этих людей?
implementation
1600
x1419
523D
Statistics of Recompressing Videos
*special problem
,
data structures
,
implementation
1600
x2364
518C
Anya and Smartphone
constructive algorithms
,
data structures
,
implementation
1600
x6100
518A
Vitaly and Strings
constructive algorithms
,
strings
1600
x9309
510C
Fox And Names
dfs and similar
,
graphs
,
sortings
1600
x17070
508C
Anya and Ghosts
constructive algorithms
,
greedy
1600
x4505
500C
New Year Book Reading
constructive algorithms
,
greedy
,
implementation
,
math
1600
x5849
500B
New Year Permutation
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
1600
x9015
495B
Modular Equations
math
,
number theory
1600
x7373
493C
Vasya and Basketball
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1600
x6965
476C
Dreamoon and Sums
math
1600
x5778
453A
Little Pony and Expected Maximum
probabilities
1600
x10962
446A
DZY Loves Sequences
dp
,
implementation
,
two pointers
1600
x12761
444A
DZY Loves Physics
greedy
,
math
1600
x3448
440B
Balancer
greedy
,
implementation
1600
x2016
435C
Cardiogram
implementation
1600
x2591
431C
k-Tree
dp
,
implementation
,
trees
1600
x26465
430A
Points and Segments (easy)
constructive algorithms
,
sortings
1600
x2301
429B
Working out
dp
1600
x9026
424C
Magic Formulas
math
1600
x5571
416C
Booking System
binary search
,
dp
,
greedy
,
implementation
1600
x8155
411B
Multi-core Processor
implementation
1600
x1291
407B
Long Path
dp
,
implementation
1600
x6669
407A
Triangle
brute force
,
geometry
,
implementation
,
math
1600
x4957
405C
Unusual Product
implementation
,
math
1600
x4718
383A
Milking cows
data structures
,
greedy
1600
x5335
380A
Sereja and Prefixes
binary search
,
brute force
1600
x2722
377A
Maze
dfs and similar
1600
x23333
375B
Maximum Submatrix 2
data structures
,
dp
,
implementation
,
sortings
1600
x5114
375A
Divisible by Seven
math
,
number theory
1600
x4987
373B
Making Sequences is Fun
binary search
,
implementation
,
math
1600
x2511
372A
Counting Kangaroos is Fun
binary search
,
greedy
,
sortings
,
two pointers
1600
x13469
371C
Hamburgers
binary search
,
brute force
1600
x27993
369C
Valera and Elections
dfs and similar
,
graphs
,
trees
1600
x10564
364A
Matrix
combinatorics
,
data structures
,
implementation
1600
x4751
353C
Find Maximum
implementation
,
math
,
number theory
1600
x4964
350C
Bombs
greedy
,
implementation
,
sortings
1600
x6602
348A
Mafia
binary search
,
math
,
sortings
1600
x13464
346A
Alice and Bob
games
,
math
,
number theory
1600
x8833
343B
Alternating Current
data structures
,
greedy
,
implementation
1600
x14371
343A
Rational Resistance
math
,
number theory
1600
x9060
340C
Tourist Problem
combinatorics
,
implementation
,
math
1600
x4310
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4997
333A
Secrets
greedy
1600
x4080
323A
Black-and-White Cube
combinatorics
,
constructive algorithms
1600
x800
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